Reusable spacecraft engine tested in Mississippi

Two AR-22 engines, being used for a developmental reusable spacecraft, are seen in Stennis, Miss., Monday, July 2, 2018. Triggering a massive cloud of vapor and a roar, officials on Monday test fired a rocket engine designed to be part of the reusable spacecraft that can launch into space repeatedly with a quick turnaround time. [Photo: AP /Gerald Herbert]